Hello Redbaron, I have to base my opinion on the opinions of people who know better than me the subject. I dismounted the dagger and it seems that it is not a reproduction. The author of the book "German Daggers" assured me that he knew no copy to date ... According to other sources, it is not unlikely that the manufacturer has made several models. I contacted the family of Mr. Emil Wackerle but I could not have any details.
So, it is true that for the moment, impossible to say if the dagger is 100% authentic.